Aibplane-engrbte muffler



"F 1 HAUMAN.. 'AI RPLANE ENGINE MUFFLER. APPLICAT'ION FILED JUNE 5, i918.

Patented Oct. 14, 1919.

r n S S I a I WITNESSES mmvrole Fin/2k JH u/nan A Ira/m5 1 "UNiTED STATESPPATENT OFFICE;

FRANK J. HAUMAN, OF BAY SHORE, YORK.

. pensive muflier which AIRPLANE-ENGINE MUFFLER.

Specification of Letters Patientl Patented Oct.14, 1919.

, Application filed June 5,1918. Serial No. 238,334.

To all whom it may concern: I Be it known that I, FRANK J. HAUMAN,

acitiz'en of the United States, and a resi-' dent of Bay Shore, in the county of Suffolk and statewof New York, have invented a new and Improved Airplane-Engine Muffier, ,of which the following is a full, clear, and exact description, ii

This'invention relates to mulllers for propelling engines for airplanes, automobiles and the like, which depends for its success- I ful operation on the production of a sue tionthrou gh the exhaust pipe of the engine,

thus eliminating back pressure while efi'ectively muflling the sound.

The invention has for its general objects to provide a comparatively simple and inexincludes a suitably shaped chamber open at its rear for the out. let of the exhaust gases, and having a plurality of fans rotatably mounted in the chamber at a point behind that where the exhaust pipe connects with. the chamber, whereby the rotation of the fans draws off the exhaust gases.

.A more specific object ofthe invention is the provision of a wlndwheel at the front of the .inufller' for driving the fan blades within the same, such wheel being driven by air pressure due to the forward motion of the vehicle on which the muliler is mounted.

With such and other objects in view, the

I invention comprises various novel features I; of construction and arrangement of-parts which will be set forth with particularity in the following description and claims appended hereto, Y

In the accompanying drawing which illustrates one embodiment of the invention and 'dicate corresponding-pants in all the views, Figure 1 is a central vertical section of the mufller;

Fig. 2 is a detail view of one of the fanshaped bearings; and

Fig. 3 is atransverse 33, Fig. 1.

eferri to the'drawing, 1 designates the cylindrical body of the mufller which has its front end. closed by a head 2shaped on stream line design, and the rear of the ody has a conicalnozzle or outlet 3, Consection on the line rear of the exhaust has its forward end 8 extending out of the I shown within wherein similar characters of reference 1nlik closed nected with the interior of the body at a point adjacent the front is an exhaust pipe 4 from a gas engine, there being a cowl 5 extending into the body, whereby the exhaust gases are more effectively drawn to the rear.

Extending through' the body is an axially disposed shaft'fi on the rear portion of which are mounted a plurality of fan elements 7 axially spaced apart and located to the pipe 4. The shaft, which head '2, is mounted in ball bearings 9 in spiders 1O fastened in the ends of the body 1. On the front end of wheel 11 against which the air acts as the vehicle moves forwardly, whereby the shaft 6 is rotated at a high speed, so that the fans .within the body 1 will tend to produce a vacuum into which the exhaust gases flow. The blades of adjacent fans are staggered so that the products of combustion must pass through a greater number of passages that assist materially in muflling thesound while at pressure.

From the foregoing description taken in connection with the accompanying drawing, the advantages of the construction and method of operation will be readily understood by those skilled in the ant to which the invention appertains, and while I have described the principle of operation, to-

gether with the device which I now consider to be the best embodiment thereof, 1

the shaft is a wind theusame time eliminating back desire-to have it understood that the device .of the shaft for rotating the same. mufller for airplane and other en gines comprising a body having a closed.

shaft extending longitu pointed forward end, a windwheel at the front of the body, a suction-producing fan within the body and driven by the 'Wind- Wheel, and an engine exhaust conneetion -With the body at a point front of the pointed forward end, a windwheel at the front of the body, a suction-producing fan Within the body and driven by the windv wheel, an engine exhaust connection with the bodyat a point in front of the said means, and a tapering nozzle connected with the rear end of the body.

FRANK J, HAUMAN. 

